An object is an instance of a class. The memory is allocated only when an object is created and not when a class is defined. How to Return an Object in C++? An object can be returned by a function using the return keyword. There is no specific technique to return an object, you can simply return it just like any other data type returning from the function. Consider the following syntax. Syntax The syntax for returning an object from the function is as follows: class_name function_name(class_name obj1) // Passing object { class_name obj2; ... Read More

The lifetime of a static variable in a C++ function exists till the program executes. We can say the lifetime of a static variable is the lifetime of the program. The static variable is a variable that is declared using the static keyword. The space for the static variable is allocated only one time, and this is used for the entirety of the program. In this article, we will understand the lifetime of the static variable and the reason behind its lifetime. Why do Static Variable Exists until program execution? A static variable is initialized ... Read More

Structures and classes are very similar in C++ except for some differences. So details about these differences are given below that help to decide when to use a class or structure in C++.Differences between Class and StructureAll the members of a class are private by default. This is different compared to structures as all the members of a structure are public by default.A program that demonstrates a class in C++ is given as follows −Example#include using namespace std; class Example {    int val; }; int main() {    Example obj;    obj.val = 20;    return 0; }This ... Read More

In this assignment we work with files. Files are everywhere in this Universe. In computer system files are essential part. Operating system consists a lot of files. Python has two types of files-Text Files and Binary Files. Here we discuss about Text Files Here we focus some of the important functions on files. Number of words Number of characters Average word length Number of stop words Number of special characters Number of numeric Number of uppercase words We have a test file "css3.txt", we are working on that file Number of words When we count number of ... Read More

Morse Code Translator is used in Cryptography. It is named by Samuel F. B. Morse. By this technique we convert a message to a series of dots, commas, "-", "/". This technique is very simple. Every alphabet in English signifies a series of ".", ", ", "/", "-". We just encrypt the message from message to symbols and decrypt from symbols to English. The dictionary is given below 'A':'.-', 'B':'-...', 'C':'-.-.', 'D':'-..', 'E':'.', 'F':'..-.', 'G':'--.', 'H':'....', 'I':'..', 'J':'.---', 'K':'-.-', 'L':'.-..', 'M':'--', 'N':'-.', 'O':'---', 'P':'.--.', 'Q':'--.-', 'R':'.-.', 'S':'...', 'T':'-', 'U':'..-', 'V':'...-', 'W':'.--', 'X':'-..-', 'Y':'-.--', 'Z':'--..', '1':'.----', '2':'..---', '3':'...--', '4':'....-', '5':'.....', ... Read More

Sometimes we feel to create something different which is very exciting, and according to human nature, we always love to share it. Python also fulfills those wishes. Using Python, if we want to share our Python program with our friends we can do that, only need to have the same version of Python installed with all the modules those are used in program of their machine. First we need to install CX_Freeze module using pip install CX_Frezze command in command prompt. First step is to solve this assignment, a python program conversion. We need standard library modules, here we ... Read More

The multiprocessing package supports spawning processes. It refers to a function that loads and executes a new child processes. For the child to terminate or to continue executing concurrent computing, then the current process hasto wait using an API, which is similar to threading module.IntroductionWhen we work with Multiprocessing, at first we create process object. Then it calls a start() method.Example codefrom multiprocessing import Process    def display():       print ('Hi !! I am Python')       if __name__ == '__main__':       p = Process(target=display)       p.start()       p.join()In this example, ... Read More

Before using Tweet in Python, we have to follow some steps. Step1 − at first we must have a tweeter profile and then it has to be added with our mobile number. First go to - Settings -> Add Phone -> Add number -> Confirm -> Save. We have to follow these steps. Then turn off all text notifications. Step2 − Set up a new app. Follow − Twitter Apps -> Create New App -> Leave Callback URL empty -> Create Twitter application. Then display message "Your application has been created. You review and adjust your application's settings". Step3 − ... Read More

Synchronization between processesMultiprocessing is a package which supports spawning processes using an API. This package is used for both local and remote concurrencies. Using this module, programmer can use multiple processors on a given machine. It runs on Windows and UNIX os.All equivalent synchronization primitives are present in this package.Example codefrom multiprocessing import Process, Lock    def my_function(x, y):       x.acquire()       print ('hello world', y)       x.release()       if __name__ == '__main__':       lock = Lock()    for num in range(10): Process(target= my_function, args=(lock, num)).start()Here one instance can lock ... Read More

In Python provides SunPy package for create solar image. In this package has different files which are solar data of proton/electron fluxes from various solar observatory and solar labs. Using pip install sunpy command, we can install sunpy package. Here we plot a sample AIA image. AIA is Atmospheric Imaging Assembly. This is another instrument board of the SDO. Here we use sunpy.Map() function to create a map from one of the supported data products. Example code import sunpy.map import matplotlib.pyplot as plt import sunpy.data.sample my_aia = sunpy.map.Map(sunpy.data.sample.AIA_171_IMAGE) fig = plt.figure() ax = plt.subplot(111, projection=my_aia) my_aia.plot() my_aia.draw_limb() ... Read More